112,497 research outputs found
Bs Mixing, DeltaGamma_s and CP Violation
We discuss the results from the Tevatron experiments on mixing and {\sf CP}
violation in the system, with particular emphasis to the
first measurements of the decay width-difference and the {\sf
CP} violating phase using flavor tagging information. We also briefly
review the charge asymmetry measurements in semileptonic decays and in
decays.Comment: 6 pages, 4 figures, Pub. Proceedings of the XLIIIrd Rencontres de
Moriond on Electroweak Interactions and Unified Theories, La Thuile, Italy,
March 1-8, 200
Combinatorial point for higher spin loop models
Integrable loop models associated with higher representations (spin k/2) of
U_q(sl(2)) are investigated at the point q=-e^{i\pi/(k+2)}. The ground state
eigenvalue and eigenvectors are described. Introducing inhomogeneities into the
models allows to derive a sum rule for the ground state entries.Comment: latest version adds some reference
Non-local scaling operators with entanglement renormalization
The multi-scale entanglement renormalization ansatz (MERA) can be used, in
its scale invariant version, to describe the ground state of a lattice system
at a quantum critical point. From the scale invariant MERA one can determine
the local scaling operators of the model. Here we show that, in the presence of
a global symmetry , it is also possible to determine a class of
non-local scaling operators. Each operator consist, for a given group element
, of a semi-infinite string \tGamma_g with a local operator
attached to its open end. In the case of the quantum Ising model,
, they correspond to the disorder operator ,
the fermionic operators and , and all their descendants.
Together with the local scaling operators identity , spin
and energy , the fermionic and disorder scaling operators ,
and are the complete list of primary fields of the Ising
CFT. Thefore the scale invariant MERA allows us to characterize all the
conformal towers of this CFT.Comment: 4 pages, 4 figures. Revised versio
Recommended from our members
Stochastic programming and scenario generation within a simulation framework : An information systems perspective
Recommended from our members
Stochastic programming and scenario generation within a simulation framework : An information systems perspective
Characterizing topological order by studying the ground states of an infinite cylinder
Given a microscopic lattice Hamiltonian for a topologically ordered phase, we
describe a tensor network approach to characterize its emergent anyon model
and, in a chiral phase, also its gapless edge theory. First, a tensor network
representation of a complete, orthonormal set of ground states on a cylinder of
infinite length and finite width is obtained through numerical optimization.
Each of these ground states is argued to have a different anyonic flux
threading through the cylinder. In a chiral phase, the entanglement spectrum of
each ground state is seen to reveal a different sector of the corresponding
gapless edge theory. A quasi-orthogonal basis on the torus is then produced by
chopping off and reconnecting the tensor network representation on the
cylinder. Elaborating on the recent proposal of [Y. Zhang et al. Phys. Rev. B
85, 235151 (2012)], a rotation on the torus yields an alternative basis of
ground states and, through the computation of overlaps between bases, the
modular matrices S and U (containing the mutual and self statistics of the
different anyon species) are extracted. As an application, we study the
hard-core boson Haldane model by using the two-dimensional density matrix
renormalization group. A thorough characterization of the universal properties
of this lattice model, both in the bulk and at the edge, unambiguously shows
that its ground space realizes the \nu=1/2 bosonic Laughlin state.Comment: 10 pages, 11 figure
A search for Z' in muon neutrino associated charm production
In many extensions of the Standard Model the presence of an extra neutral
boson, Z', is invoked. A precision study of weak neutral-current exchange
processes involving only second generation fermions is still missing. We
propose a search for Z' in muon neutrino associated charm production. This
process only involves Z' couplings with fermions from the second generation. An
experimental method is thoroughly described using an ideal detector. As an
application, the accuracy reachable with present and future experiments has
been estimated.Comment: 13 pages, 3 figures, late
The Razumov-Stroganov conjecture: Stochastic processes, loops and combinatorics
A fascinating conjectural connection between statistical mechanics and
combinatorics has in the past five years led to the publication of a number of
papers in various areas, including stochastic processes, solvable lattice
models and supersymmetry. This connection, known as the Razumov-Stroganov
conjecture, expresses eigenstates of physical systems in terms of objects known
from combinatorics, which is the mathematical theory of counting. This note
intends to explain this connection in light of the recent papers by Zinn-Justin
and Di Francesco.Comment: 6 pages, 4 figures, JSTAT News & Perspective
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